#region License
// Copyright (c) Jeremy Skinner (http://www.jeremyskinner.co.uk)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// The latest version of this file can be found at https://github.com/jeremyskinner/FluentValidation
#endregion

namespace ServiceStack.FluentValidation
{
    using System;
    using System.Linq;
    using ServiceStack.Model;
    using ServiceStack.Validation;
    using System.Collections.Generic;
    using ServiceStack.FluentValidation.Results;
    using ServiceStack.Text;

    /// <summary>
	/// An exception that represents failed validation
	/// </summary>
	public class ValidationException : ArgumentException, IResponseStatusConvertible
    {
		/// <summary>
		/// Validation errors
		/// </summary>
		public IEnumerable<ValidationFailure> Errors { get; private set; }

		/// <summary>
		/// Creates a new ValidationException
		/// </summary>
		/// <param name="message"></param>
	    public ValidationException(string message) : this(message, Enumerable.Empty<ValidationFailure>()) {

	    }

		/// <summary>
		/// Creates a new ValidationException
		/// </summary>
		/// <param name="message"></param>
		/// <param name="errors"></param>
		public ValidationException(string message, IEnumerable<ValidationFailure> errors) : base(message) {
			Errors = errors;
		}
		/// <summary>
		/// Creates a new ValidationException
		/// </summary>
		/// <param name="errors"></param>
		public ValidationException(IEnumerable<ValidationFailure> errors) : base(BuildErrorMesage(errors)) {
			Errors = errors;
		}

		private static string BuildErrorMesage(IEnumerable<ValidationFailure> errors) {
			var arr = errors.Select(x => "\r\n -- " + x.ErrorMessage).ToArray();
			return "Validation failed: " + string.Join("", arr);
		}

        public ResponseStatus ToResponseStatus()
        {
            var errors = Errors.Map(x =>
                new ValidationErrorField(x.ErrorCode, x.PropertyName, x.ErrorMessage)
                {
                    Meta = x.CustomState as Dictionary<string, string> ?? x.FormattedMessagePlaceholderValues.ToStringDictionary()
                });

            var responseStatus = ResponseStatusUtils.CreateResponseStatus(typeof(ValidationException).GetOperationName(), Message, errors);
            return responseStatus;
        }
    }
}